The suspect accused of stabbing nine people, including six children, at an Idaho apartment complex attacked a child’s birthday party to “take vengeance” after he was asked to leave, police said Sunday.

A visibly emotional Boise Police Chief William Bones described how first responders found the injured in the street and in hallways after the Saturday evening attack. He said the birthday girl, a three-year-old, was among the victims along with five other children between four and 12 years old.

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He said that some of the victims had suffered life-threatening injuries and added that “the level of some of the injuries will be life-altering in a very negative way.”

Timmy Earl Kinner, 30, of Los Angeles, was arrested and has been charged with nine counts of battery-aggravated assault and six counts of injury to a child. Bones said Kinner had a lengthy criminal record that included weapons charges and arrests for “violence against others” and had served prison time in Kentucky.

Bones said Kinner had been staying with a female resident of the apartment complex who had offered him a place to stay as “a helping hand.” However, the woman realized the arrangement was not working and asked Kinner to leave Friday. The chief said Kinner had left “peacefully” when asked. The woman with whom he’d been staying was not at the complex when the attack unfolded, while the birthday party was taking place just a few doors away.

Investigators said the victims included recently resettled refugee families from Syria, Iraq and Ethiopia. However, Bones said there was no evidence that the attack constituted a hate crime.

On Sunday, colorful bouquets rested just outside crime-scene tape. The apartment complex is just off of one of Boise’s busier streets, separated from the traffic by one of the many irrigation canals that run through the city. Bones said police had recovered the “large, folding-blade” knife Kinner was believed to have used in the attack from the canal.

Bones had said that the attack resulted in the most victims in a single incident in Boise Police Department history.

“It’s just something we just don’t see in Boise,” he told reporters Sunday. “It tears your heart apart.”

About half of all Americans now live under sanctuary policies that shield illegal immigrants from law enforcement, according to the latest tally of jurisdictions that the Federation for American Immigration Reform is releasing Thursday.

FAIR calculates there were 564 states and municipalities that refuse some level of cooperation with federal immigration authorities as of April 1, up more than 200 since President Trump took office and up more than 500 compared with a decade ago. There were just 40 sanctuaries when President Obama took office.

Entire states such as California, Illinois and New York are now sanctuaries, as well as major cities and counties such as Fairfax, Montgomery and Prince George’s counties and the District of Columbia in the capital region, according to the list.

Combined, the sanctuaries on FAIR’s list cover 49 percent of the country’s population, The Washington Times calculated.

“This is just an astounding and a dramatic surge of sanctuary jurisdictions,” said Bob Dane, executive director at FAIR. “They’ve doubled in just two years, and if you game that out, if the exponential growth continues, it’s not going to be long before it’s accurate to say the U.S. is a sanctuary country.”

While there is no official definition of sanctuaries, FAIR counted any jurisdiction that bans police or other officials from asking about immigration status, forbids communication with U.S. Immigration and Customs Enforcement, or refuses to hold likely deportees for pickup by ICE.

For the latest on the Waffle House shooting, read Monday’s live updates.

Nine months before the police said he opened fire with an AR-15 rifle on a Waffle House in Nashville, killing four people, Travis Reinking wanted to set up a meeting with the president of the United States.

That, at least, is what he told officials when they charged him with unlawful entry after he crossed an exterior security barrier near the White House complex in July, records show.

That arrest was only the latest of Mr. Reinking’s several run-ins with the authorities. Police reports show family members expressed concern for his welfare after an extended time exhibiting delusional behavior, including his belief that the entertainer Taylor Swift was stalking him and hacking his phone and Netflix account.

After his arrest for the White House episode, Mr. Reinking, 29, who lived in Morton, Ill., was forced to surrender three rifles and a handgun to officials in August. Somehow he got them back — the authorities in Illinois said on Sunday that the circumstances were unclear — and in the fall, he moved to Nashville.

On Sunday, he pulled up to a Waffle House in the Antioch neighborhood of Nashville around 3:19 a.m., sat in his pickup truck for about four minutes and then opened fire, the police said.

Don Aaron, a spokesman for the Metropolitan Nashville Police Department, said at a news conference on Sunday that after leaving the restaurant, Mr. Reinking shed his jacket. In it were two magazines of AR-15 ammunition.

The police credited a customer with averting further bloodshed. The customer, James Shaw Jr., 29, seized the moment when he saw Mr. Reinking apparently trying to reload his rifle. Mr. Shaw burst out from behind a swinging door where he had been hiding, wrested the weapon away and threw it over a countertop.

“I kind of made up my mind, because there was no way to lock that door, that if it was going to come down to it, he was going to have to work to kill me,” Mr. Shaw said at the news conference.

Mr. Reinking fled on foot, and apparently returned to his apartment nearby to put on pants. He was last seen shirtless and shoeless, Police Chief Steve Anderson said. Investigators had yet to determine a motive for the killings.

Officials could not fully explain how Mr. Reinking regained possession of his weapons after they were taken away following his episode near the White House last year, which prompted federal authorities to work with county officials in Illinois to investigate Mr. Reinking. The Tazewell County Sheriff’s Office in Illinois gave the weapons he owned — including the AR-15 he took to the Waffle House on Sunday — to his father.

Sheriff Robert M. Huston of Tazewell County said in a news conference on Sunday that while Mr. Reinking “voluntarily surrendered” the weapons on Aug. 24, his father had a firearm owner’s identification card and a legal right to take the weapons.

“He was allowed to do that after he assured deputies that he would keep them secure and away from Travis,” Sheriff Huston said. “We have no information about how Travis came back into possession of those firearms.”

The police in Nashville indicated that Mr. Reinking’s father returned the weapons to his son. The father, Jeffrey Reinking, could not be reached for comment on Sunday.

Even before he went to Washington, Mr. Reinking had a history of encounters with law enforcement in Illinois.

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According to one sheriff’s report from May 27, 2016, he “was delusional and believed the famous entertainer, Taylor Swift, was harassing him via stalking and hacking his phone.” It added that he said he found Ms. Swift at a Dairy Queen in Morton and chased her before she disappeared.

Mr. Reinking’s family members said he had had these delusions since August 2014. The report noted that “Travis is hostile towards police and does not recognize police authority.”

In another episode on June 16, 2017, in Tremont, Ill., the police responded to a complaint that Mr. Reinking, wearing a woman’s pink housecoat, jumped into a pool and began arguing with lifeguards to get them to fight with him. No one at the pool wanted to press charges, the report said.

James Shaw Jr., who is being hailed as a hero after he disarmed a gunman at a Waffle House, spoke Sunday at a news conference in Nashville. He said he decided, “If it was going to come down to it, he was going to have to work to kill me.”

Mr. Aaron said Mr. Reinking was believed to have moved to Nashville in the fall and worked in the crane and construction industries. Mr. Reinking was fired from a job about three weeks ago and found a new job, Mr. Aaron said, but had not been seen at work since Monday.

The authorities said Mr. Reinking could still be in possession of a handgun and a rifle, which Chief Anderson described as “more of a hunting-type rifle than an assault rifle.”

The Nashville police identified the four people who died as one Waffle House employee, Taurean C. Sanderlin, 29, of Goodlettsville; and three customers: Joe R. Perez, 20, of Nashville; DeEbony Groves, 21, of Gallatin; and Akilah Dasilva, 23, of Antioch.

Jennifer Wetzel, a spokeswoman for Vanderbilt University Medical Center, said one wounded victim was in critical condition and another was in critical but stable condition. Two other victims were treated for minor injuries and discharged from TriStar Southern Hills Medical Center in Nashville, said Katie Radel, a spokeswoman there.

Waffle House restaurants are open 24 hours and speckled throughout the South, especially along the interstates.

The gunfire on Sunday was the latest burst of violence at one of the chain’s outposts. In January, an altercation at a Waffle House in Missouri turned fatal when a security guard opened fire. And a deadly shooting outside a location in Florida that same month recently led to a lawsuit.

Still, Sunday’s attack was especially jarring in its method and magnitude.

Walt Ehmer, the company’s chief executive, said it was a “very sad day” and thanked Mr. Shaw. “You are a hero,” he said. “You’re my hero.”

But Mr. Shaw demurred. “I’m not a hero,” he said, adding that he acted out of self-preservation.

A West Virginia woman was arrested for beheading her boyfriend before telling cops, “You have to take me back and let me get my heads,” as they drove her away from the bloody scene, authorities said.

A judge in Mercer County said further assessment is needed to evaluate the mental competency of Roena Cheryl Mills, who is charged with second-degree murder in the death of 29-year-old Bo Allen White, WVNS reported.

Mills, according to court documents obtained by the station, was found covered in blood while wearing a glove on her left hand when deputies responded on April 1 to a home on Eden Valley Road in Lerona.

Using a fake name, Mills, 41, told responding deputies she was cut and left bloodied after being thrown through a glass door. She then got combative with officers and was placed under arrest. Once inside a deputy’s cruiser, Mills reportedly said: “You have to take me back and let me get my heads.”

Later that day, cops were tipped off to the decapitated body of a man found on another block in town. A different, unidentified part of his body was also found where Mills was arrested, WVNS reports.

The killing, according to the criminal complaint, was a “decapitation homicide,” Mercer County Prosecuting Attorney George Sitler said.

“That’s how it appears,” Sitler told West Virginia MetroNews.

A court-ordered mental status evaluation will determine if Mills can face trial in White’s brutal death. The case will then be presented to a grand jury in June. If 12 of 16 grand jurors find probable cause in the alleged killing, Mills will be indicted either on a first- or second-degree murder charge, according to the prosecutor.

“Even though she’s only been initially charged with second-degree murder because there was some initial doubt about premeditation, [the] grand jury could certainly indict her for first-degree murder,” Sitler told the station.

Mills, of Rural Retreat, Virginia, remained in custody at the Southern Regional Jail in Raleigh on $210,000 cash-only bail as of Monday, jail records show.

While in custody at the jail, Mills — who was dating White, according to his father — had been talking about killing someone, employees told WVNS.

Deputies were called to the second home after its owners saw someone suspicious in their driveway, WVNews reports. A glove matching one that Mills was wearing at the time was found earlier at White’s home, according to the station.